Moonglow
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dormant supply lines can introduce residual spores into a fresh pool, the National Park Service (NPS) and experts point out that D.C.'s extreme summer heat and the darker "American Flag Blue" paint act as a catalyst for rapid algae growth. [1, 2]As usual, you're ignorant. Educate yourself.
The water in the Lincoln Memorial Reflecting Pool is circulated and cleaned as part of its maintenance to control algae growth and ensure water quality. The National Park Service performs annual cleanings and has installed a circulation system to help maintain the pool.
Wikipedia
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